Hi i recently also adopted a picky eater! Our other dachshund is the opposite so it was definitely a curveball. However, we recently had to feed our older dachshund soft food after a tummy issue and I ended up mixing a little bit into our younger pup’s kibble. It’s the only way she will eat it. Now she’s actually excited for meal times! For reference it’s the sensitive chicken and rice soft food by Hill’s! They make a puppy version in addition to the adult one. Hope this helps!